Water-indicator for steam-boilers



UNITED STATES PATENT OFFICE.

MARTIN ROBBINS AND JNO. L. FRISBIE, OF CINCINNATI, OHIO.

WATER-INDICATOR FOR STEAM-BOILERS.

Specification of Letters Patent No. 21,699, dated October 5, 1858.

To all whom t may concern.'

Be it lrnown that we, MARTIN BOBBINS and JOI-IN L. Fnrsnm, both ofCincinnati, Hamilton county, Ohio, have invented a new and usefulImprovement in Tater-Indicators for ,Steam-Boilers; and we do herebydeclare the following to be a full and eXac-t description thereof,reference being had to the annexed drawings, making part ot' thisspecification.

This is an improvement in that class of water level indicators in whicha steam alarm is sounded whenever the water sinks below a certain leveland the invention relates first to a provision for the adjustment orchange of the point of alarm while the instrument is in its place in theboiler, and, second, to a provision for ready access to the steam alarmvalve while in the boiler.

A, is a small Steam chamber or dome secured as shown in a hole in thetop of the boiler. The interior diameter of this dome is barelysutlicient to contain the main pipe B and its branch C, the main pipebeing secured as shown, in the dome-top instead of in the top of theboiler, D is the whistle,v

E is the arm for the attachment of the customary7 float and e, itscounter arm projecting behind the fulcrum, F, is a rod or stem whichentering ay stuiiing boX H at the top of the pipe B passes centrallydown the latter and is screw threaded (f) below and tapped wit-hin thelower end of the said pipe B.

The stem F terminates below in a swivel I, which constitutes theattachment for the fulcrum of the ioat arm E e.

A branch C from the main pipe B, is closed at the top with a. commonvalve K, said valve being operated in the usual Way by a lifter L,hinged to the counter arm e of the float.

Immediately over the valve K, the dome A, has an aperture a, which isclosed by a screw-cover M.

By turning the stem F by means of a handle Gr, or otherwise, the swivelI forming the fulcrum of the float is moved up or down-and thus thepoint of alarm is graduated to the minimum stage of water desired or thealarm may be sounded by hand by temporarily turning up the stem F, whenit is desired to use the whistle for the ordinary purposes of signaling.

Vhen it is desired to inspect, repair or replace the valve K, thescrew-cover M is removed so as to aiord ready access without removingthe whistle or disturbing any other attachments.

It will be seen that this arrangement necessitates but one perforationof the boiler, namely that made for the dome.

The following is what we claim as of our invention and desire to secureby Letters Patent:

l. In the described combination with a customary steam alarm; we claimthe steam pipe B, provided with a central screw stem and swivel F f, I,supporting the fulcrum of the float arm in the manner and for thepurposes set forth.

2. In this connection we claim the small steam dome A a, inclosing thebranched pipe B C, valve K and lifter L, substantially as, and for thepurposes set forth.

In testimony of which invention we hereunto set our hands MARTINROBBINS. JNO. L. FRISBIE.

Attest:

GEO. I-I. KNIGHT, C. STEEMER.

